What is the difference between a galaxy and a nebula?

Galaxies and nebulae are two different objects found in space. Galaxies are large systems of stars, planets, and gas held together by gravity. On the other hand, nebulae are clouds of gas and dust in space where stars are formed.

The primary difference between a galaxy and a nebula is their size and composition. Galaxies are much larger than nebulae and contain many more stars. Galaxies can be further classified into different types, including elliptical, spiral, and irregular. Nebulae, on the other hand, are classified as either emission, reflection, or dark nebulae based on how they interact with light.

Another difference between galaxies and nebulae is their formation. Galaxies are formed by the collision and merging of smaller galaxies. Nebulae, on the other hand, are formed by the collapse of gas and dust in space. As the gas and dust come together, they become denser and hotter, eventually forming a protostar that becomes a full-fledged star.